Type a chemical formula (e.g., H2O, Ca(OH)2, CuSO4·5H2O). Use a dot · or period . for hydrates. The molar mass auto-calculates from the periodic table.
| # | Formula | Moles (mol) | Molar Mass (g/mol) | Mass (g) | Output Unit | Notes | Action |
|---|---|---|---|---|---|---|---|
| 1 |
Unknown symbol or malformed formula.
|
Override if needed.
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These override the internal table. Useful for isotopic or dataset-specific adjustments.
Example data table
| Formula | Moles (mol) | Molar Mass (g/mol) | Mass (g) | Mass (kg) |
|---|---|---|---|---|
| H2O | 2.5 | 18.01528 | 45.0382 | 0.0450382 |
| NaCl | 1.2 | 58.443 | 70.1316 | 0.0701316 |
| Ca(OH)2 | 0.75 | 74.09268 | 55.5695 | 0.0555695 |
| CuSO4·5H2O | 0.10 | 249.685 | 24.9685 | 0.0249685 |
| C6H12O6 | 0.05 | 180.156 | 9.0078 | 0.0090078 |
Values are illustrative; recompute with your required precision.
Formula used
mass (g) = moles (mol) × molar mass (g/mol)
Molar mass is calculated from the chemical formula by summing each element count times its atomic mass. Parentheses multipliers and hydrate dots are supported, e.g., CuSO4·5H2O.
- Example: For H2SO4 ⇒ 2×H + 1×S + 4×O.
- Units: If output unit is kg or mg, the grams are converted accordingly.
- Rounding: Displayed values round to 4–6 significant places; export preserves full precision where available.
How to use this calculator
- Click Add row. Enter a chemical formula and moles.
- Press the ↻ button or leave molar mass blank to autocalculate.
- Choose an output unit (g, kg, or mg) for convenience.
- Repeat for multiple compounds. Click Compute all to update everything.
- Optionally paste custom atomic masses to override the defaults.
- Use Download CSV or Download PDF to export results.
For education and planning; verify against your quality requirements.
Common compounds and molar masses
| Compound | Formula | Molar Mass (g/mol) |
|---|---|---|
| Water | H2O | 18.01528 |
| Sodium chloride | NaCl | 58.443 |
| Calcium carbonate | CaCO3 | 100.0869 |
| Ethanol | C2H6O | 46.06844 |
| Glucose | C6H12O6 | 180.156 |
| Sulfuric acid | H2SO4 | 98.079 |
| Ammonia | NH3 | 17.03052 |
| Copper(II) sulfate pentahydrate | CuSO4·5H2O | 249.685 |
| Calcium hydroxide | Ca(OH)2 | 74.09268 |
| Acetic acid | C2H4O2 | 60.052 |
Rounded values; use the autocalc for precise dataset-specific values.
Quick mole → mass conversions
| Formula | Moles (mol) | Molar Mass (g/mol) | Mass (g) | Mass (kg) |
|---|---|---|---|---|
| H2O | 0.25 | 18.01528 | 4.50382 | 0.00450382 |
| H2O | 1.00 | 18.01528 | 18.01528 | 0.01801528 |
| NaCl | 0.10 | 58.443 | 5.8443 | 0.0058443 |
| NaCl | 0.50 | 58.443 | 29.2215 | 0.0292215 |
| C6H12O6 | 0.05 | 180.156 | 9.0078 | 0.0090078 |
| C6H12O6 | 1.50 | 180.156 | 270.234 | 0.270234 |
Mass = moles × molar mass. Convert to kg by dividing grams by 1000.
Selected atomic masses (reference)
| Element | Name | Atomic Mass (u) |
|---|---|---|
| H | Hydrogen | 1.00794 |
| C | Carbon | 12.0107 |
| N | Nitrogen | 14.0067 |
| O | Oxygen | 15.9994 |
| Na | Sodium | 22.98976928 |
| Mg | Magnesium | 24.3050 |
| Al | Aluminium | 26.9815386 |
| Si | Silicon | 28.0855 |
| P | Phosphorus | 30.973762 |
| S | Sulfur | 32.065 |
| Cl | Chlorine | 35.453 |
| K | Potassium | 39.0983 |
| Ca | Calcium | 40.078 |
| Fe | Iron | 55.845 |
| Cu | Copper | 63.546 |
| Zn | Zinc | 65.38 |
Use custom overrides for isotopic compositions when necessary.